Molding for electric wiring.



W. H. G. KIRKPATRICK. MOLDING FOR BLBGTRIG WIRING.

. PPPPPPPPPPPPPPPPP 0T. 222222 s. 936,639. Patented Oct. 12, 1909.

INVENTR.

` w. Sm/17AM www@ 5MM@ A TTORNE Y.

To` all whom, it may concern:

trating wires held to WILLIAM H. G. KIRKPATRICK, F PHILADELPHIA, PENNSYLVANIA.

MOLDING FOR ELECTRIC WIRING.

Specification of Letters Patent.

rat-mima oct. 12, 1909.

Application led October 27, 1908. Serial No. 459,693.

Be it known that .1, VILLIAM H. G. KinnrATRICK, a citizen of the United States, re-

siding at Philadelphia, in the county of` Philadelphia and Statepof Pennsylvania,-

have invented certain new Aand useful ,Improvements in Moldings for Electric Wiring, of which 4the following 1s a specification.

This invention relates to improvements inmoldings such, for instance, asv are used for receiving and holding in suspended position electric wires, the sar-ne being an improvement upon the invention granted to me under date of September 27, 1907, in United States Letters Patent No. 867440. Much dilicult-y has been experienced in. obtaining a molding eiiicient in character and at the same time capable of being manufactured and sold at a cost not in excess of the cost of ordinary molding as used at the present time.

The principal object of the present invention is to provide a moldingof'the class recited that is commercially valuable and which is simple in construction, effective in use and whichv can be made by machinery in 'a single and continuous operation thereby producing Yainolding that can be made and sold for the same price as the common form of moldings now upon the market.

Other objects of the invention relate to general details of construction and arrangement of parts.

The invention consists of the improvements hereinafter described and finally claimed. l The nature, characteristic features and scope of the inventioirwill be more fully un- 4derstood from the following description taken in connection with the accompanying 1,drawings forming part hereof and' in which:

Figure 1, is a face view of the under side of a molding embodying vthe invention. Fig. 2, is a vertical longitudinal view in section taken upon the line 2-2 of Fig. 1.

Fig. 3, is a transverse view in section-illus-v trating a wire contained within one of the grooves and held to place therein in accordance with the invention. Fig. 4, is a face view of the under side of the molding illusplace within the grooves; and Fig. 5, is a view in transverse section of the molding' in its'complete form.

In the drawings the molding 1, .may be provided upon its under side with two or more longitudinal grooves 2, adapted to receive and retain in suspended position electrical wires 3. Moldings of the present type, usually of wood, are used largely for attachment to ceilings and when so located assume thel .position shown in Figs. 2, 3, and 5. Obviously when the wires are suspended witliintlieir respective grooves some means must be present to maintain them in place prior to the attachment of the molding cap et. Attempts have ideen made in thel past to `provide a molding etlicient in use and inexpensive in nature for facilitating this suspension, and while moldings at present available are efficient in use, the cost of manufacture is so far in excess of the cost of ordinary molding, that they are commercially, practically useless. In order to overcome these disadvantageous features, use is made in the present invention of ordinary molding the longitudinal grooves of which are at intervals throughout the length of the molding provided with yielding or resilient portions that normally protrude within the said grooves and in the path of a wire about to be inserted therein. As clearly illustrated in Fig. Lthe side walls of the longitudinal grooves 2, are incised or cut in a diagonal manner inwardly or away from said grooves y as at 5. Bymeans of this incision there are provided generally wedge-shaped pieces 6, integral with the molding.` These wedgel shaped pieces shown as being oppositely disposed, protrude within the grooves 2, and in practice are more or less yielding or resilient, and serve to exert pressure upon a wire whenI suspended within its groove. In the manufacture of this molding the machinery used for gouging out the grooves 2, and otherwise shaping the molding may be equipped with rotary elementsprovided 'with cutting tools for 'forming the above described wedge-like resilient parts 6. thewood is being run'through the molding machine to shape it and cut the grooves 2, the rotary elements will operate upon the said molding as the same is about to leave the ma-. chine, thereby in one operation and without any rehandling ofthe wood o'rLvl stopping ofv the machine producing a commercially valuable molding at a cost not in excess of the cost of manufacture of ordinary molding.

When a wire is inserted for suspension within a groove of the molding of the invention the parts 6, above described yield to the pressure necessary to insert the xwire and assume `the position shown in Fig. 4:, thus at intervals'throughout the length of the By this operation while molding clenching or holding firm the Wire and prei-renting its falling from out its groove as is clearly illustrated in Fig. 3, until the molding cap 4, is applied as shown in Fig. 5.

In practice it is customary to apply to the finished molding a coat of peint and in the present instance it has been found that when paint-s applied the same enters the incision or cuts 5, and swells as it were 4the connecting parts or joints of the Wedge-like pieces (5, and serves to spread the said pieces 6, and add to their yielding qualities. As shown in Figs. l', and et, the yielding pieces 6, of one groove are shown in staggered relation With the saidpieces of the other groove.

1. A molding of the class recited equipped With alongitudinal Wire receiving groove the opposite Walls of seid groove having retaining portions et intervals which project WILLIAM H. G. KIRKYAT UCK.

Witnesses William J. JACKSON, M. E. EAsTLAoK. 

